[Zope] RuntimeError: Shouldn't load state for '\x00\x00\x00\x00\x00\x006\xd1' when the connection is closed

Hi, I have to face a recent problem : when I restart my Zope server, I can see pages several times but after a few requests, I receive the message written in this message's subject. Of course, I'm writing my own Zope products, but never close database connection manually. Loading the given object from a little Python script (Zope.app()._p_jar['...']) gives me an "<extension class BTrees.Length.Length at 553020>". Where could this problem come from ??? I didn't make any big update on my Zope site/products before this problem occurs... Thanks for any help, Thierry -- Linux every day, keeps Dr Watson away... http://gpc.sourceforge.net -- http://www.ulthar.net